A kind of preparation method of highly dispersed ultrafine neodymium oxide

Abstract

The present invention relates to a preparation method of highly dispersible ultrafine neodymium oxide. The preparation method of the highly dispersible ultrafine neodymium oxide includes processes such as mixing ingredients, extraction, chemical precipitation, burning, hydrogen crushing and oxidation; the present invention combines Chemical precipitation and hydrogen crushing process, chemical precipitation to obtain neodymium fluoride, after calcining to obtain micron-sized neodymium oxide, and then hydrogen absorption to remove residual single-phase neodymium, calcining and oxidation again to improve purity, single crystal neodymium absorbs hydrogen and expands in the hydrogen absorption stage Grain boundary breakage occurs at the micro level, resulting in intergranular fracture, improving the fineness of neodymium oxide and optimizing the particle shape; the production process is simple, the product particle size and dispersion are good, and the particles are uniform spherical and almost monodisperse under the scanning electron microscope. It is used as an additive Can be evenly dispersed in the material.

Description

technical field [0001] The invention belongs to the technical field of neodymium oxide processing, and in particular relates to a preparation method of highly dispersive ultrafine neodymium oxide. Background technique [0002] Neodymium oxide is an important rare earth compound, which is widely used in precision instruments and characteristic glasses. It is also a raw material for preparing various neodymium alloys and permanent magnetic alloys, and is often used in laser technology. [0003] Neodymium oxide is stored in the form of powder and acts as an additive. It can be used as an additive in the preparation of materials such as metal, glass, ceramics, and grinding and cutting wheels, thereby improving and improving the quality of the product. In the process , the physical properties of NdO powder, such as particle size, dispersibility, and fluidity, will directly affect the quality and use of the product, so the properties of NdO powder will greatly affect the performan...

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Problems solved by technology

[0004] At present, there are mainly three methods for preparing ultra-fine neodymium oxide. One is the sol-gel method. Obtain neodymium oxide micropowder, this method can obtain ultrafine neodymium oxide, but the product has poor dispersion and uneven particle size distribution, and it is difficult to disperse in other materials as an additive

The other is the physical pulverization method, which is to pulverize conventional neodymium oxide by ball milling and other physical methods to obtain superfine neodymium oxide. It is characterized by simple operation, but the product purity is low, and the physical properties of the crushed crystal grains decrease.

There is also a chemical precipitation method, which mainly adds a precipitant to a solution containing neodymium ions, and obtains neodymium oxide powder after filtration and burning. It is characterized by low production costs and low equipment requirements, but the obtained oxide powder The particle size of neodymium is large, it is difficult to control, and the particle dispersion is poor

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